Microporous plates are sheets with tiny pores created on the surface of substrates such as metal, plastic, and glass through specific processes. Their core characteristic is that the pore size is typically less than or equal to the plate thickness; in some high-precision applications, the pore size can be as low as 0.1mm.
Key Parameters
Pore Size Specifications: The standard range is 0.1mm-5mm. 0.1mm-1mm micropores are high-precision and suitable for precision filtration and biological experiments. 1mm-5mm micropores are general-purpose and primarily used for acoustic noise reduction and ventilation.
Perforation Rate: This is the ratio of the total micropore area to the total plate area. It is typically controlled between 1% and 3%, with 1%-2.5% providing the best sound absorption and filtration effects, making it the mainstream choice for industrial applications.
Substrate and Thickness: Metal substrates are the most widely used, with a typical thickness of 0.2mm-3mm. Plastic substrates are suitable for the biomedical field, with thicknesses as low as 0.1mm.
Main Types and Processing Technologies of Microporous Plates
Laser Drilling: Utilizes a high-energy laser beam to penetrate the substrate. It can process flat and irregularly shaped plates with a wide range of applicable thicknesses and a minimum hole diameter of 0.1mm. Advantages include high drilling precision and uniform hole positions, suitable for small-batch, high-precision custom orders. Disadvantages include lower processing efficiency and higher cost, primarily used in high-end applications such as aerospace and precision instruments.
Chemical Etching: Forms micropores on the substrate surface through chemical etching. Only applicable to flat plates with a maximum thickness of 2mm and a minimum hole diameter of 0.15mm. Key advantages include smooth and uniform hole surfaces and strong hole diameter consistency. It can process micropore patterns of any shape, suitable for large-volume, thin-plate orders, and widely used in electronic components, biochips, and other fields. However, this process requires material compatibility; some metals with poor corrosion resistance require special treatment.
Precision CNC Stamping: Processes micropores using high-precision stamping dies. Applicable plate thicknesses range from 0.2mm to 2mm, and the minimum hole diameter is 0.8mm. Advantages include high processing efficiency and low cost, suitable for mass standardized production; disadvantages include high mold wear and difficulty in machining high-precision small holes, primarily used in general-purpose acoustic noise reduction and ventilation filters.
Electrical Discharge Machining (EDM): This process uses electrical discharge to erode the substrate, forming micropores. It can process planar and irregular parts, with plate thicknesses up to 150mm and a minimum hole diameter of 0.8mm. Suitable for machining thick plates and specially shaped workpieces, but the hole surface smoothness is insufficient and taper exists, making it more suitable for mechanical manufacturing and mold processing where precision requirements are not extremely high.
Application Areas:
Biomedicine and In Vitro Diagnostics: Plastic microplates are a core consumable in this field, commonly available in 96-well and 384-well specifications, used for cell culture, enzyme-linked immunosorbent assays (ELISA), and high-throughput drug screening.
Filtration and Separation: High-precision metal microplates, with their corrosion resistance and ease of cleaning, are used for liquid and gas filtration, such as chemical wastewater treatment, food and beverage purification, and air purification systems.
In the field of electronics and precision instruments: Etched microporous plates are used for ventilation and heat dissipation, and electromagnetic shielding of electronic components, such as speaker filters for mobile phones and computers, and sensor protective covers.
